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You need to disconnect the stator from the regulator before making any useful measurements on whether the charge winding of stator is working. They affect each other so much that you can rarely tell who is at fault. When disconnected the charge winding should put out 9.5 volts AC or so while cranking (substantially higher if the quad starts). This is measured from winding end to end (it isn't tied to engine ground yet - that is done inside the regulator). It should also be about 1.2 ohms end to end. If you have the AC voltage and the ballpark resistance then the stator is fine.
Next check and double check the wiring connections, and then change the regulator.
The regulator is a shunt regulating device. As the output voltage of the stator charging system increases with engine speed the regulator crowbars the excess energy to ground, putting the charge system into current limit to maintain the 14.5 volts or so across the battery. With such a capability, a defective regulator can easily make the output of the stator look low.
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